Checkout - Honeywell 7800 Series Manual

RM7840E,G,L,M
STATIC CHECKOUT • CHECKOUT
TABLE 4—STATIC CHECKOUT (Continued)
Test RM7840
No. Models
WARNING
!
Make sure all manual fuel shutoff valves are closed.
13 RM7840
E,L
models
14 RM7840
E,G & L
models
15 RM7840M
models
with Open
Damper
Contacts
16 RM7840M
models
with Open
Damper
Contacts
17 RM7840M
models
with
Open
Damper
Contacts
Final All
!
WARNING
Do not allow fuel to accumulate in the combus-
tion chamber. If fuel is allowed to enter the
chamber for longer than a few seconds without
igniting, an explosive mixture could result. It is
recommended that you limit the trial for pilot to
ten seconds, and limit the attempt to light the
main burner to two seconds from the time the fuel
has reached the burner nozzle. In any case, do not
exceed the nominal lightoff time specified by the
equipment manufacturer. Close the manual fuel
shutoff valve(s) if the flame is not burning at the
end of the specified time.
Test Volt-
Jumpers Meter
4-5 19-L2 Firing rate motor drives closed; zero
and volts at terminal 19 after motor
14-13 starts driving closed.
15-13 — 1. Raise set point of series 90
controller—firing rate motor
should drive toward open.
2. Lower set point of series 90
controller—firing rate motor
should drive toward closed.
4-13 — If damper motor is used, motor
drives damper open.
4-5 18-L2 If damper motor is used, spring return 1. Low Fire Start Switch.
drives motor and damper closed;
line voltage at terminal 18 after
motor is in Low Fire position.
4-5 18-L2 If damper motor is used, motor
and drives open; zero volts at terminal
4-13 18 after motor starts driving open.
CAUTION
!
On completing these tests, open the master switch and remove all test jumpers from the
subbase terminals. Also remove bypass jumpers from the low fuel pressure limits (if used).
Normal Operation
!
CAUTION
1. Use extreme care while testing the system.
Line voltage is present on most terminal con-
nections when power is on.
2. Open the master switch before removing or
installing the RM7840.
3. Make sure all manual fuel shutoff valve(s) are
closed before starting the initial lightoff check
and the Pilot Turndown tests.
4. Do not put the system in service until you have
satisfactorily completed all applicable tests in
this section and any others required by the
equipment manufacturer.
24
If Operation Is Abnormal,
Check The Items Listed Below
1. Low Fire Start Switch.
2. Firing rate motor and transformer.
1. Series 90 Controller.
2. Firing rate motor and transformer.
1. Damper motor.
2. Damper motor.
1. Low Fire Start Switch.
2. Damper motor.

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